package com.googlecode.wicketcharts.highcharts;

import java.text.MessageFormat;

import javax.swing.text.html.Option;

import org.apache.wicket.Component;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.markup.html.IHeaderResponse;

import com.googlecode.wicketcharts.JavaScriptResourceRegistry;
import com.googlecode.wicketcharts.highcharts.options.ChartOptions;
import com.googlecode.wicketcharts.highcharts.options.Options;

/**
 * This behavior takes in an {@link Options} object containing the configuration
 * of a chart and calls the proper javascript to display the chart in the
 * component to which this behavior is added.
 * 
 * @author Tom Hombergs (tom.hombergs@gmail.com)
 * 
 */
public class HighChartBehavior extends Behavior {

	private static final long serialVersionUID = 1L;

	private final HighChartContainer container;

	/**
	 * Constructor.
	 * 
	 * @param options
	 *            the options for the chart. The {@link Option} class is very
	 *            similar in structure to the Highcharts API reference, see
	 *            http://www.highcharts.com/ref/.
	 */
	public HighChartBehavior(HighChartContainer container) {
		this.container = container;
	}

	@Override
	public void renderHead(final Component component,
			final IHeaderResponse response) {
		Options options = container.getOptions();

		// we need an ID to connect this component with Highcharts
		component.setOutputMarkupId(true);

		// include javascript dependencies
		JavaScriptResourceRegistry.getInstance().getJQueryEntry()
				.addToHeaderResponse(response);
		JavaScriptResourceRegistry.getInstance().getHighchartsEntry()
				.addToHeaderResponse(response);
		if (options.getExporting() == null
				|| options.getExporting().getEnabled() == Boolean.TRUE) {
			JavaScriptResourceRegistry.getInstance()
					.getHighchartsExportingEntry()
					.addToHeaderResponse(response);
		}

		// define markup id
		final String id = component.getMarkupId();
		if (options.getChartOptions() == null) {
			options.setChartOptions(new ChartOptions());
		}
		options.getChartOptions().setRenderTo(id);

		// call Highcharts.setOptions() with language data since language
		// information can only be set globally
		if (options.getLanguageOptions() != null) {
			response.renderJavaScript(MessageFormat.format(
					"Highcharts.setOptions('{'lang:{0}'}');", options
							.getLanguageOptions().toJson()), "highcharts-lang");
		}

		// define javascript variable
		String chartVarname = "highchart_" + id;
		response.renderJavaScript(
				MessageFormat.format("var {0};", chartVarname), "highcharts-"
						+ chartVarname + "-declare");
		response.renderOnDomReadyJavaScript(MessageFormat.format(
				"{0} = new Highcharts.Chart({1});", chartVarname,
				options.toJson()));
	}

}
